Began to learn mathematics knowledge systematically.
Learn slowly to keep up with the progress. Don't be surprised.
And in junior high school, coupled with the pressure of other subjects, there is more time to study.
Began to use the idea of equations. Use unknowns, substitutions, etc. The formula will also increase.
Study hard, as long as you listen to the teacher in class and finish your homework independently, your grades should not be a problem. If you want to improve your level, you can choose another workbook.
However, don't give up the knowledge behind you once you don't understand it. It's like snowballing. The knowledge in junior high school is more difficult than that in primary school and simpler than that in senior high school. But it is impossible to complete all the raids in one year. We should lay a solid foundation step by step!
Come on! Study hard! In my later life, I will gradually discover that knowledge is power!